CompTIA Updated N10-009 Exam Questions and Answers by madiha

The correct answer is D: Increase the scope to 10.8.100.50 – 10.8.100.175. According to the CompTIA Network+ N10-009 objectives, proper DHCP scope configuration is essential to ensure all hosts can obtain valid IP addresses and communicate beyond their local segment.

In this scenario, the DHCP scope is configured for 10.8.100.50 through 10.8.100.150, while a reservation range exists from 10.8.100.151 through 10.8.100.175. The network scan shows that IP addresses up to 10.8.100.175 are already in use. This indicates that some devices are either statically assigned addresses outside the active scope or are failing to receive valid DHCP leases, causing the new laptops to communicate only with each other—often a sign of APIPA or improper addressing.

To ensure full connectivity, the DHCP scope must be expanded to include the entire range of addresses that are actively in use, including the reserved addresses. Option D correctly extends the scope to 10.8.100.175 without overlapping lower addresses that may be statically assigned or intentionally excluded.

The Network+ objectives emphasize avoiding address conflicts and ensuring DHCP scopes align with real-world network usage. Expanding the scope to include all valid addresses ensures that all laptops can obtain proper IP configuration, default gateway information, and full network connectivity.

The correct answer is Shielded Twisted Pair (STP). According to the CompTIA Network+ N10-009 objectives, intermittent connectivity issues—especially in environments like hospitals—are often caused by electromagnetic interference (EMI) from medical imaging equipment, power systems, and other electronic devices. These environments are electrically noisy and can disrupt standard copper Ethernet cabling.

STP cabling is specifically designed to mitigate EMI by incorporating shielding around the twisted pairs. This shielding reduces external interference and improves signal stability without requiring a complete redesign of the network. Importantly, STP is significantly less expensive than deploying fiber-optic solutions while still being highly effective in environments prone to interference.

Single-mode fiber would eliminate EMI entirely, but it is far more costly due to specialized cabling, transceivers, and installation requirements. Twinaxial cable is typically used for short-distance, high-speed data center connections and is not appropriate for workstation connectivity. Spanning Tree Protocol (STP) is a Layer 2 loop-prevention protocol and has nothing to do with physical connectivity or interference issues.

The Network+ objectives stress choosing solutions that balance effectiveness, cost, and environmental suitability. In this case, upgrading to shielded twisted pair cabling provides the most practical and cost-effective resolution for intermittent connectivity in a hospital imaging environment.

The first step in any troubleshooting process is to identify the problem. This includes gathering information from the user, reviewing logs, and observing the symptoms. In this case, identifying the scope and nature of the issue (e.g., signs of ransomware) is critical before forming any theories or plans.

From Andrew Ramdayal’s guide:

“The troubleshooting methodology begins with identifying the problem. This step involves questioning users, identifying user changes, and determining the symptoms.”

To prioritize traffic and utilize a constrained link more effectively, the engineer should implement QoS (Quality of Service). QoS is a set of mechanisms that classifies and marks traffic (for example, voice, video, business-critical apps) and then applies queuing and scheduling behaviors to ensure important traffic receives preferential treatment during congestion. Network+ objectives commonly connect QoS to supporting real-time applications (VoIP/video) by reducing latency, jitter, and packet loss, while preventing less critical traffic (bulk transfers, updates) from consuming all available bandwidth. Techniques can include traffic classification, DSCP marking, priority queuing, and traffic shaping/policing.

A CDN improves content delivery by caching closer to users, but it doesn’t provide link-level prioritization for all traffic types. A VPN provides secure tunneling/encryption, not prioritization. TTL (Time To Live) is an IP header value used to prevent routing loops by limiting packet lifespan; it does not manage bandwidth or prioritize flows. QoS is the standard solution when the goal is to control how bandwidth is allocated under load and to ensure critical services remain performant.

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